What constitutes a ‘trip’? Examining child journey attributes using GPS and self-report

Active travel is associated with improved health and development outcomes in children. Accurate detection of children's travel behaviors and routes, however, is problematic. Travel diaries are often used to collect information on children's travel behaviors, yet no evidence for the accuracy of this methodology exists. This study investigated the validity of children's self-reported trips (origin, destination) compared with an objective criterion (global positioning systems units; GPS). Children (n = 10, 9–11 y) wore the GPS units for seven consecutive days between March and June 2011 and completed travel diaries daily with researcher assistance. Affinity group interviews were conducted in December 2011 with 30 children from two schools to garner perspectives on trip definition, neighborhood perceptions, and to illuminate GPS and travel diary findings. GPS journeys were manually compared with travel diary journeys for destination sequencing, start times, and travel mode. Accuracy in trip sequencing was compared by day type, and journey type using percentage differences and the chi-square (χ²) statistic. Of the 380 trips captured, 54.5% of journey sequences were fully or partially matched, 22.4% were GPS only trips and 23.2% travel diary only. Greater accuracy (full/partial match) was observed for weekdays than for weekend days and for the journey to or from school than for other journeys. Travel mode agreement existed for 99% of matched trips. Although children's travel diaries may confer contextual journey information, they may not provide completely accurate information on journey sequencing. Thematic analysis of affinity group data revealed that reasons for this are multifaceted, including differing concepts of what constitutes a ‘trip’. A combined approach of GPS and travel diary is recommended to gather a comprehensive understanding of children's journey characteristics.     

“We’ve Lost Our Bearings”: Place,Tourism, and the Limits of the “Mobility Turn”

Abstract: The “mobility turn” claims that conceding analytical priority to the study of mobility is the best way to overcome methodological approaches based on fixed and stable categories argued to be unviable in a world that is increasingly mobile. In this paper I argue that the mobility approach, far from reaching this goal, in fact reifies the cleavage between mobility and immobility, relegating immobility to a passive, undertheorized position, and collapsing the complex workings of power, thus foreclosing a dialectical understanding of the contradictory albeit co‐produced processes of mobilization and immobilization. Drawing on an ethnographic analysis of the impacts of changing patterns of accumulation of the tourist industry on the urban space of Palma (Majorca, Spain), I suggest a relational approach attentive to the dialectics of mobility and stability, continuity and change.     

“It's About Time You Came Out”: Sexualities,Mobility and Home

Abstract: Helping redress the dominance of metropolitan narratives upon which much literature on sexuality is framed, this article interprets the narrative told by a “white” 16‐year‐old man living in regional Australia. Our aim is to investigate the intersections of migration and homemaking in sexual subject formation. Finding a place to call “home” can be a complex process for young men born in regional Australia and not conforming to the social formations of a “normal guy”. This young man's narrative expressively reveals the fluidity and spatiality inherent in processes of negotiating sexual subjectivities. His story provides telling insights into how migration and mobility change his understandings of home and of self by making possible a third‐space configured by neither the gender norms of his hometown nor the “gay scene” in Sydney.     

Identifying locals, migrants, and captives in the Wari Heartland: A bioarchaeological and biogeochemical study of human remains from Conchopata, Peru

The site of Conchopata in the central Peruvian Andes was the secondary center in the heartland of the Wari Empire (AD 600–1000), and in this study we examine whether this urban locale was populated by locals, voluntary migrants from distant regions, and/or captives who were forcibly brought to Conchopata. We examine radiogenic strontium isotope ratios from 72 dental enamel and bone samples representing 31 formal burials and 18 human trophy heads to distinguish between locals and non-locals, and we examine skeletal and archaeological data to establish whether non-local persons were voluntary migrants or captives. We also describe a new, straightforward technique in the evaluation of radiogenic strontium isotope ratios to assist in detecting non-locals when large datasets are available.Results show that natal Conchopata inhabitants should exhibit radiogenic strontium isotope ratios that range from ⁸⁷Sr/⁸⁶Sr = 0.70548 to ⁸⁷Sr/⁸⁶Sr = 0.70610. Thus, among the 31 burials, 29 exhibit local values, suggesting that Conchopata was not a cosmopolitan center to which numerous foreigners migrated; rather, it was populated by local peoples, likely the descendants of the preceding Huarpa culture. The two individuals with non-local radiogenic strontium isotope ratios are an infant and a 17–22 years old female. The archaeological context suggests that the female may have been taken captive for subsequent sacrifice, as she was interred in front of the ritual D-shaped structure in which decapitated human heads (trophy heads) and sacrificed camelids were deposited. Among the 18 trophy heads sampled, 14 have non-local values, confirming previous studies of smaller samples that suggested that Wari warriors travelled to other locales and took captives—both adults and children—for subsequent transformation into trophy heads. Additional analyses of bone-tooth pairs from a subsample (12 burials and six trophy heads) shows that the burial group was much more sedentary (homogenous radiogenic strontium isotope ratios in bones and teeth) and the trophy head individuals were much more mobile (heterogenous radiogenic strontium isotope ratios in bones and teeth). Overall, the multiple lines of evidence support the notion that the Wari Empire occasionally used militaristic means, combined with elaborate ritualism, to subjugate other populations, a tactic that may have helped Wari establish and maintain control in particular regions in the Andes.     

Mobility-driven cultural transmission along the forager-collector continuum

Hunter-gatherers mobility regimes are often treated as discrete adaptive strategies. Here we present a model of forager mobility which treats collectors and foragers as two ends of a continuous spectrum. We show that a mobility regime can be situated along this spectrum by specifying the number of foraging moves a group makes before returning to its home base. The model allows us to explore the behavioural space between forager (i.e. residential mobility) and collector (logistical mobility) adaptations. We discuss the heuristic value of the model by showing how it can be used to make testable predictions about the impact of mobility strategies on archaeological measures such as occupation intensity and raw-material transportation distance. We then use the model to investigate the impact of mobility on rates of cultural transmission. We show that mobility-driven cultural transmission may be equivalent to a Poisson process and that the time it takes for a cultural behaviour to be transmitted between two mobile groups is optimized when the mobility regime is somewhere between pure forager and pure collectors adaptations. In addition, we find that rates of cultural transmission decline in a very regular way, as the inverse of the square root of the number of moves made before returning to home base. This suggests that there is a mechanistic connection between the mean-squared displacement of hunter-gatherers in space and the transmission of cultural traits.     

Tracing population mobility in the Aegean using isotope geochemistry: a first map of local biologically available Sr/Sr signatures

Strontium isotope ratio (⁸⁷Sr/⁸⁶Sr) analysis of archaeological human skeletal remains is an efficient method of investigating past population movement and residential mobility by determining probable geographical origins for the individuals examined. For this to be achieved, however, a map of biologically available ⁸⁷Sr/⁸⁶Sr signatures across the region investigated is needed. This paper presents a first such map for the Aegean, based on ⁸⁷Sr/⁸⁶Sr values recovered mainly from archaeological animal dental enamel and modern snail shells from sites largely distributed in the southern part of this region. Although not exhaustive, this comprehensive dataset of local biologically available ⁸⁷Sr/⁸⁶Sr signatures shows a marked difference between Mainland sites of the Pindos and Parnassos zones and the islands of south-eastern Aegean crossed by the Sub-Pelagonian zone (0.70808–0.70869), and sites in the central Cyclades and the north-eastern Aegean islands falling into the Attic-Cycladic metamorphic belt and the Vardar zone, respectively (0.70926–0.71187). Biologically available ⁸⁷Sr/⁸⁶Sr values from sites on central Euboea in the Pelagonian zone, south-eastern Attica and the western Cyclades in the Attic-Cycladic metamorphic belt, and on Crete in the Gavrovo zone are also relatively high (0.70853–0.70931), but lower than those recorded for the central Cyclades and the north-eastern Aegean.     

Solubility of corundum + kyanite in H2O at 700°C and 10 kbar: evidence for Al‐Si complexing at high pressure and temperature

The solubility of the assemblage corundum + kyanite in H₂O was determined at 700°C and 10 kbar, using a piston‐cylinder apparatus and rapid‐quench/fluid‐extraction techniques. Weighted mean concentrations of total Al and Si were 5.80 ± 0.03 mmol kg^?1 H₂O and 0.308 ± 0.003 mol kg^?1 H₂O, respectively (1σ errors). The Al concentration is nearly five times higher than that of corundum solubility in pure H₂O. This difference is interpreted to arise from complexing between Si and Al to form HAlSiO_4,aq species. Charged or more polymerized species are also possible, but their abundance cannot be constrained based on these experiments. Assumption of a single aqueous aluminosilicate complex permits calculation of the thermodynamic consequences of Al‐Si interaction in high‐pressure fluids, as well as phase diagrams for the system Al‐Si‐O‐H. Formation of Al‐Si complexes leads to a large increase in dissolved Al with increasing Si in solution, such that Al concentration in equilibrium with kyanite + quartz is predicted to be 7.1 mmolal, higher than with kyanite + corundum. The elevated concentration of Si in deep‐crustal and mantle aqueous fluids suggests that Al must readily be dissolved and transported by Al‐Si complexing in high‐pressure metamorphic and metasomatic environments. The results provide a simple explanation for the common observation of kyanite + quartz segregations in eclogites and Barrovian metamorphic rocks.     

Early prehistoric sedentism and seasonal animal exploitation in the Caribbean lowlands of Colombia

San Jacinto 1 represents a special-purpose settlement that was used by late Archaic foraging groups who logistically moved from base camps to special-purpose camps in order to collect and process subsistence resources at the onset of the dry season in the Caribbean savannas of northern Colombia. Situated in an optimal location for permanent water and seasonal concentrations of dry season subsistence items, the site’s location was part of a logistic strategy in which specific task groups were moved to resources during a short season of availability. Preserved vertebrate and invertebrate faunas at San Jacinto conform to expectations about assemblage ubiquity, richness, and evenness or equitability within the early occupational strata at the site. Specific animals including turtles and fish were pursued, and may have been processed with C3 plants and grasses in ubiquitous earth ovens. Certain local aquatic invertebrates were also procured along with the collection of specific extra-local gastropods.     

Mapping an invisible population: the uneven geography of second-home tourism

Second-home tourism is a very popular form of tourism in many countries, particularly in the Nordic countries. More than half of the Swedish population have access to second homes. Previous studies have revealed that there is great variation between different second homes. Examples range from rustic Australian shacks, lonely cabins in the Norwegian mountains, spacious Swedish archipelago villas and palatial Russian dachas. Still, second homes are often seen and analysed as a unitary category – a perspective that obscures the considerable heterogeneity within the category as well as spatial differences in the impact of second-home tourism. Using a second-home typology from previous research and data on about 660,000 second homes, we analyse the heterogeneity of second homes by mapping the composition of the Swedish second-home stock. Results show the uneven geography of second-home tourism, revealing significant and sometimes steep differences between peripheral areas and urban hinterlands, tourism hot-spots, and areas in decline. Based on these results, we assert that there is good cause to move away from using second homes as a unitary category. Instead, we argue for viewing second homes as an umbrella concept with dwelling use in focus. This enables a greater sensibility to place and more accurate analyses of the uneven impacts of second-home tourism. The results also give greater insights into the impact of the ‘invisible population’ of second-home owners from a public planning perspective.     

Migration and tertiary educated youth: a reflexive view of mobility decision-making in an economic crisis context

Despite the popularity of student and graduate migration as research topics, mobility decision-making among tertiary educated youth is relatively neglected, resulting in under-appreciation of the complexity of this process. This article seeks to overcome this shortcoming through taking a reflexive view, recognising the significance of personal considerations alongside economic motives as potential mobility drivers. Evidence is drawn from a survey of 400 undergraduates aged 25 and under conducted in Dublin during 2014, with results illustrating anticipated destinations, durations of stays abroad and the bearing of the economic crisis. Using logistic regression, the influence of a range of subjective level factors is explored in relation to different mobility choices. This analysis leads towards a concluding summary that posits a reflexive view on student and graduate mobility decision-making, illustrated with qualitative case study evidence.